# Radiation Therapy Physics- Mosby Board Review Questions

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1. The half life of Ir 192 is 74 days. The decay constant is:
In2/74= 0.00094 days-1
2. What are the differences between an electron and a proton?
• Electrons are light, negatively charged particles:they can collide and interact with other particles
• Protons are are heavy, positively charged particles that can only interact with electrons
3. Types of decay include all of the following EXCEPT:
1)alpha
2) neutron
3)beta
4)internal conversion
neutron
4. During x-ray production, the reslting x-ray bem comes from electrons colliding with the target and causing interactions such as:
3)auger electrons
4) all of the above
all of the above
5. The positive side of the x-ray tube is known as the:
• anode
• "A's are positive :) "
6. A radioactive source has an initial activity of
60 mCi. It's half life is 8 days. What is the remaining activity after 10 days?
• 25 mCi
• A=Ao(.5)t/h
• A=60(.5)10/8
7. The average life of a source with a half life of 8 days is:
• 8 (1.44)=11.5 days
• T1/2(1.44)
8. The ratio of x-ray to heat in x-ray production is:
Variable  depending on the maximum energy of the electrons traversing the tube
9. The radioactive decay of a isotope is characterized by its:
decay constant
10. An elastic collision is one in which:
the incoming electron gives up all of its energy to the electron it encounters
11. The energy of an electromagnetic radiation is inversely proportional to its
wavelength
12. If a 50 keV electron collides with an inner shell electron with a binding energy of 25 keV, the resulting photoelectron will have an energy of:
• 25 keV
• (50-25)
13. The energy of an electromagnetic radiation is directly proportional to its:
frequency
14. List photon interactions:(5)
• compton
• coherent
• photodisintegration
• photoelectric
• pair production
15. List electron interactions(2):
• bremmstrahlung
• characteristic
16. The decay of Cobalt-60 to stable lead is an example of ____decay.
beta negative

(gamma rays and beta negative)
17. Regarding isotopes, isotopes of an element have the same number of______but a different number of neutrons.
protons
18. Match the following:
Isotopes: ___        A. Ir192   Ir192m
Isobars:  ___         B.  27Fe59  27Fe58
Isotones: ___        C. 28Ni60  31Ga60
Isomers: ____        D.  11Na22   10Ne27
• Isotopes: _B__   (7Fe59  27Fe58)
• Isobars:  _C__     ( 28Ni60  31Ga60
• Isotones: _D__     (1Na22   10Ne27)
• Isomers: _A___    (Ir192   Ir192m)
19. Ir192  is an ________.
isomer
20. If the decay constant of a particularisotope is 45 sec-1, the half life is:
• 0.015 sec
• In2/decay constant = half-life
21. If the half-life of Co-60 is 5.26 years, what is the average life?
1.44(5.26)=7.57 years

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 Author: jaxkaty5437 ID: 262446 Filename: Radiation Therapy Physics- Mosby Board Review Questions Updated: 2014-03-08 14:41:13 Tags: Radiation Therapy Folders: Mosby Board Review Questions,RTT Board Review Description: Radiation Therapy Physics- Mosby Board Review Questions Show Answers:

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